package com.atguigu.study.safe;

import java.sql.Array;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * @auther zzyybs@126.com
 * @Date 2025-04-23 14:14
 * @Description: TODO
 */
public class NotSafeDemo
{
    public static void main(String[] args)
    {
        Map<String,String> map = new ConcurrentHashMap<>();//new HashMap<>();

        map.put("1","z3");
        map.put("1","li4");

        System.out.println(map.size() +"\t"+ map.get("1"));
    }

    private static void mapNotSafe()
    {
        Map<String,String> map = new ConcurrentHashMap();//Collections.synchronizedMap(new HashMap<>());//new HashMap<>();

        for (int i = 1; i <=100; i++) {
            new Thread(() -> {
                map.put(Thread.currentThread().getName(), UUID.randomUUID().toString().substring(0,6));
                System.out.println(map);
            },String.valueOf(i)).start();
        }
    }

    private static void setNotSafe()
    {
        Set<String> set = new CopyOnWriteArraySet();//Collections.synchronizedSet(new HashSet<>());//new HashSet<>();

        for (int i = 1; i <=100; i++) {
            new Thread(() -> {
                set.add(UUID.randomUUID().toString().substring(0,6));
                System.out.println(set);
            },String.valueOf(i)).start();
        }
    }

    private static void listNotSafe()
    {
        // 读写分离，写时复制
        List<String> list = new CopyOnWriteArrayList<>();//Collections.synchronizedList(new ArrayList<>());//new Vector<>();//new ArrayList<>();

        for (int i = 1; i <=100; i++) {
            new Thread(() -> {
                list.add(UUID.randomUUID().toString().substring(0,6));
                System.out.println(list);  //[befc97, 432a99, 101567]
            },String.valueOf(i)).start();
        }
    }
}
